On the gravitational structure of elementary particles
Abstract
Gravitational Bags are spherically symmetric solutions of higher dimensional KaluzaKlein (KK) theories, where the compact dimensions become very large near the center of the geometry, although they are small elsewhere. KK excitations become therefore very light when located near the center of this geometry and this appears to affect drastically the naive tower of masses spectrum of KK theories. In the context of string theories, string excitations can be enclosed by Gravitational Bags, making them not only lighter, but also localized as observed by somebody who does not probe the central regions. Strings however can still have divergent sizes, as quantum mechanics seems to demand, since the extra dimensions blow up at the center of the geometry.
 Publication:

General Relativity and Gravitation
 Pub Date:
 February 1990
 DOI:
 10.1007/BF00756204
 Bibcode:
 1990GReGr..22..131G